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Re: How could a pulse cap operate in TC?



Original poster: "Mark Broker" <mbroker@xxxxxxxxxxxxxxxx>


i can imagine 100  942C20P1K caps for 2 kw 100 bps tc, but if 2000 volts
is maximum peak-to-peak rf voltage, then i need 400 caps - it`s stupid -
so for the price, so
for the size of MMc :-)

I have run them at 3000+ volts to just to use fewer caps and save money
(EMMC). Only when they are obviously run it a constant breakdown do they
fail. 2000V is very safe but "I" have no problem running them a lot higher ;-)

They typically breakdown internally at about 5000V each. As far as I know, "most" people's MMCs are designed with ~2000V per cap at expected firing voltage (roughly 1.4* Vhv). Pros like Dr. Resonance use a lower voltage rating (I forget the formula, but it works out to about 1200V) for a cap that should last a lifetime in a museum setting.



http://hot-streamer.com/TeslaCoils/MMCInfo/GeekCaps/GeekCaps.htm
http://hot-streamer.com/TeslaCoils/MMCInfo/GeekCaps/TestSetUp.jpg
http://hot-streamer.com/TeslaCoils/MMCInfo/GeekCaps/PowerScope.jpg
http://hot-streamer.com/TeslaCoils/MMCInfo/GeekCaps/ScopeCurrent.gif
http://hot-streamer.com/TeslaCoils/MMCInfo/GeekCaps/HVTest.jpg
http://hot-streamer.com/TeslaCoils/Programs/MMCCALC2.ZIP

http://hot-streamer.com/TeslaCoils/Programs/MMCCALC2.ZIP
http://www.classictesla.com/java/javammc/javammc.html
http://hot-streamer.com/TeslaCoils/Programs/MMCcalc2xls.zip

The most recent testing is explained here: http://www.pupman.com/listarchives/2003/May/msg00682.html

The test subjects are presumed to be representative of bulk product, and the CDE caps may or may not have been "improved" some more since then.


p.s.
942C20P10K - nowadays do we have something better by the price/quality value?

I don't think so...

For $ / (C*V), yes: the 1600VDC caps have much higer capacitance ratings. While we were still selling caps, we were looking for enough interest in some of the ~.68uF, 1600VDC caps, but there was not enough to make an order. Those would make a smashing MMC for a "big" TC. . . .


IIR, our Gemini Twins run about 12kVA at 360BPS. I believe the MMC uses about a hundred 2kV, .15uF caps.

Mark Broker
The Geek Group